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Automaticity is an important phenomenon that is ubiquitous in everyday life: most of our everyday activities appear effortless and automatic. Our ease in navigating the world is the result of thousands of interactions with similar objects in similar contexts, which routinize most everyday activities. This review paper focuses on psychology and neuroscience research related to the acquisition and the detection of automatic behavior. More precisely, we present a list of key behavioral signatures of automaticity, and a few process-based explanations of automaticity. This is followed by a presentation of recent neuroscientific models and data suggesting that automatic behavior is mostly realized in the brain cortex. This article concludes with a discussion of the interactions between the different levels of explanation of automaticity.